how do I remove long lists of old bookmarks?

For over a year now, I have created html files of my bookmarks in Firefox from my main PC and then copied them to my laptop version of Firefox. I thought that would just rewrite the old bookmarks, but I see now it just adds to the old bookmarks. I've tried deleting the old bookmarks one at a time but that takes forever and it will not delete large collections of bookmarks in the old bookmark menus.

    How do I delete most or all of my old bookmarks (now hundreds) on my laptop, so I can add the new bookmarks from my main PC?
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